google cloud messaging - Unable to unregister GCM in Android -

i trying unregister gcm when user logout. using following code it.

public void logout(){          googlecloudmessaging gcm = googlecloudmessaging.getinstance(newsettings.this);         try {             gcm.unregister();         } catch (ioexception e) {             e.printstacktrace();             e.tostring();             toast.maketext(newsettings.this,"problem in logout, try again later!",toast.length_long).show();         } } 

this not unregister gcm getting exception in logcat this

07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ java.io.ioexception: main_thread 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ com.google.android.gms.gcm.googlecloudmessaging.unregister(unknown source) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ com.artqueen.aahaan.activities.newsettings.logout(newsettings.java:157) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ com.artqueen.aahaan.activities.newsettings$7.onclick(newsettings.java:120) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ android.view.view.performclick(view.java:5254) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ android.view.view$performclick.run(view.java:21173) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ android.os.handler.handlecallback(handler.java:739) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ android.os.handler.dispatchmessage(handler.java:95) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ android.os.looper.loop(looper.java:145) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ android.app.activitythread.main(activitythread.java:6837) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ java.lang.reflect.method.invoke(native method) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ java.lang.reflect.method.invoke(method.java:372) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1404) 07-14 10:54:20.718  26537-26537/com.artqueen.aahaan w/system.err﹕ @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1199) 

the documentation mentions that

so tried use this

 public void logout(){          instanceid instanceid  = instanceid.getinstance(newsettings.this);         try {             instanceid.deleteinstanceid();         } catch (ioexception e) {             e.printstacktrace();             e.tostring();             toast.maketext(newsettings.this,"problem in logout, try again later!",toast.length_long).show();         } 

}

and still getting in logcat

07-14 11:02:03.228  31682-31682/com.artqueen.aahaan w/system.err﹕ java.io.ioexception: main_thread 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ com.google.android.gms.iid.instanceid.zzb(unknown source) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ com.google.android.gms.iid.instanceid.deleteinstanceid(unknown source) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ com.artqueen.aahaan.activities.newsettings.logout(newsettings.java:158) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ com.artqueen.aahaan.activities.newsettings$7.onclick(newsettings.java:121) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ android.view.view.performclick(view.java:5254) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ android.view.view$performclick.run(view.java:21173) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ android.os.handler.handlecallback(handler.java:739) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ android.os.handler.dispatchmessage(handler.java:95) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ android.os.looper.loop(looper.java:145) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ android.app.activitythread.main(activitythread.java:6837) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ java.lang.reflect.method.invoke(native method) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ java.lang.reflect.method.invoke(method.java:372) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1404) 07-14 11:02:03.238  31682-31682/com.artqueen.aahaan w/system.err﹕ @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1199) 

am unregistering gcm in proper way ? please let me know how can achieve it. in advance.

i needed run in new thread. fixed problem. @calvinfly.

public void logout(){          instanceid  = instanceid.getinstance(newsettings.this);          thread thread = new thread(new runnable() {             @override             public void run() {                 try {                     instanceid.deleteinstanceid();                 } catch (exception bug) {                     bug.printstacktrace();                 }              }         });         thread.start(); }